Carburetor



' 1,647,058 =t-` 25219-27' w. T. SIMPSON CARBURETOR Original Filed July 16' 1923 M@ Ward T. 5 mpm Patented oct. 25,1927.` l 1,647,058 UNITED STATES PATENT OFFICE.

WARD 'I'. SIMPSGN, 0F GRAND RAPIDS', MICHIGAN, ASSIGNOB T0' ALBERT G. DICKIN- SON, F GRAN-D RAPIDS, MICHIGAN.

cannunmon.

Application illed July 16', 1923, Serial No. 651,748. Renewed Iarch 26, 1927.

This invention relates to carburetors' and In the upper side 3 of the bowl an openis particularly concerned with various' imlng is made which is closed by a, plate 14.

rovements and simplifications in structure Integral with the plate is a chamber 15 into 1n carburetors wherein the fuel supply is which the fuel first comes from the main 5 automatically kept at a predetermined level, supply tank. A plug 16 is threaded through 60 suction of the engine with which the carbuthe bottom of the chamber provided by the retor is used lowering the air pressure in the plate 14 and has a vertical opening 17 therecarburetor bowl and the greater air pressure through. Into the lower end of the opening in the main supply tank for the fuel causingr 17 the upper pointed end of a rod 18 is l0 fuel to iow to the said bowl. The invention adapted to seat, the same bein pivotally 65 consists in various novel constructions and connected at. its lower end to a fbar 19, one organizations of elements for the production end of which carries a float 20 and the other of a simple and effective carburetor of this end being pivotally mounted at 21 to a relatype as will more fully appear as undertively fixed bar 22 depending from the standing of the invention is had. from the plate 14. 70

following description taken 1n connection In the upper side of the chamber 15 a plug with the accompanying drawing, in which, 23 is secured on the under side of which a Fig. 1 isa vertical longitudinal section screen 24 1sr secured. A coupling 25 attached through the carburetor. to the plug has the main feed line pipe 26 Fig. 2 is a vertical transverse section for the fuel secured thereto, said pipe con- 75 through the fuel supply tank. necting with a similar pipe 26a which is Fig. 3 .is a horizontal section through the secured by a coupling 27 to a member 28 at upper end portion of the manually operable the upper side of the fuel tank 29, into control member for the supply of fuel from which from the coupling-27 va vertical pipe the carburetor bowl to the engine, and this 30 extends nearly to the bottom of the tank section is taken in the horizontal plane of .and in which at a plurality of spaced apart the port 4,2, Fig. 1. points small openings 32 are made in its Fig. 4 is a like section through the lower sides, the uppermost one being above the end portion thereof. This section is taken highest levelV of fuel in the tank approxialong the horizontal plane of the port 49 and mately one and one-half inches, the next ap- 85 thence along the plane of the passage 48. proximately four inches below the upper- Like reference characters refer to like most opening and the lowermost and others parts in the different figures of the drawing. which may be used in larger tanks approxi- In the carburetor construction, a single mately three inches apart from the adjacent 35 casting is made included in which is a fuel openings. vent tube to the outer atmos- 90 bowl having a bottom 1, an outer side 2, a .phere of relatively large diameter is connecttop 3 and an inner vertical side 4 extending ed with the member 28. as shown at 31. only part of the height of the side 2 and Bores 33 and 34 are made in the lower and from which projects an outwardly extending upper sides 1 and 3 of the carburetor bowl air inlet 5. At the upper side of the air inadjacent the inner side thereof and a rod 35 95 let and near the side 2, an upwardly extendpasses through the same and is rotatably ing vertical sleeve 6 is made which lies withmounted therein, having an enlarged head in an outer sleeve 7 also cast integral with 36 at its upper end passing into the bore the rest of the casting and which at its verti- 34 and at its lower end extending into an cal side 8 joining with the top 3 is thickened, opening made through the bore 33. This rod 10 as shown the purposeof whichwill appear is bored from its lower end nearlv through later. At the upper end of the vertical sleeve the head thereof. making a longitudinal pas- 7 it is reduced in size, as at 9, making a sage 37 therein. A spring 38 presses against passage 10 of less diameter ,than the inner the upper end of the head 36 to hold the rod 5U diameter of the sleeve. the usual throttle in lower position. An arm 39 extends from 105 valve 11 being mounted in the passage 10, a the head 36 and has an operating rod 40 short distance above the chamber 12 located connected therewith which may be manually above the upper end of the sleeve 6 and operated for changing the position of the which is connected by a passage 13 around member 35. An adjustable stop 41 limits the the sleeve 6 with the interior of the bowl. movement of the arm 39 in one direction.

An opening 42 is made laterall ead and communicates with t e passage 37 in member 35 and when the said member is turned to one position, said opening 42 com es through the part 59 due to the impinging of the said corner against the curved outer sides of the e lower portion of the valve is as at 64, for a portion of its hei ht, thereby providing an annular recess etween the valve and the inner walls of the sleeve 6, as at 65, for a purpose to be later set forth.

he corner at 63 on the valve 62 in a short lo th time wears a seat in the upper side of the passage nozzle member so that the 37 bel plug a one-fifth to one-third of the area of the liftslot 46 is cut 1n a side of the member 35 and ing area of the air against the under end plane with the slot a groove 47 of e valve, accordingly has a he outer side of the member 35,

gradually. decreasing in depth, as shown in th area' of the contact between the valve and nozzle was reduced to a minimum, as in a knife-edge contact. The increase in vacuum 36 and a passage 48 which leads away from the member. Fuel is carried from the bowl through an opening 49 made in the wall of that the openings and passages the fuel causing a greater flow of fuel. This in the member below the plug 44 are filled with fuel at all times. A stop plug or disk 50 fills the lower end of the opening in the bore 33,2

is made through which the nozzle member 51 may be passed upwardly, it having an enlarged lower end coverinoP passes by the throttle valve in its major porhe opening, as indicated at 52 and which 1s portions thereof strike held in place by the set screw 53, bringing sides of the chamber 12 the opemng or passage 54 in the nozzle member into conjunction with the passage 48 for the fuel. This passage 54 joins with a vertical passage 54a in the nozzle member into which the lower end of a tube 55 extends, the latter at is upper end bein slightly enlarged and flared outwardly, as sown at 55a. upper end of the tube 55 extends partly t rough a sleeve 56 tapering slightly upward on its inner sides and which is received in the upper end of an enlarged passage 57 in the fioat chamber, connected as it is by passage 13 directly 40 at 12. .es nearly as possible the pressure in and if the amount of fuel required is to be increased, it is done by actuating the operat- .ing rod 40 so as to make alarger passage through the groove 47 by turning member 35, as is obvious.

a very rich mixture is desired, as in starting, the rod 40 is operated so as to turn the member 35 a quarter' turn to bring opening 42 and being drawn directly from the bowl to the mixing ch is nearly closed. T e air rushing by the throttle breaks up and mixes with the fuel which in a rich mixture passes to the engine. In this operation, a limited amount of air passes through the port opening 35a to mix with and lighten the column of fuel passing lower end of the valve, hereafter described, as mounted in the sleeve 6. At one side a passage 60 is made through the enlarged part 59 upwardly and inwardly to passage 57, and an adjusting readed through screw 61 is largement 52 upper end passes into the passage y the same may be enlarged or restricted at will.

valve 62 in the form of a vertical cylinder is slidably mounted in the sleeve 6, being provided with a Hange at its lower end, e corner 63 at the lower side of the flange and th so th 'isl Dil

- member, a conduit sleeve and tending to curved through 'the passage 43 and facilitate the mixing with additional air passing by the valve 11. This ort opening also neutralizes the pressure 1n the passage 37 with the pressure in the float chamber when the member 35 is in operative running positlon.

The fioat assembly described is a complete unit in itself capable of attachment or removal as a unit for repair, inspection or replacement by-a new assembly. Itsmanufacture, assembly and attachment 1s slmple and relatively inexpensive. The construction as .a whole is practical in all respects and has so proved in practice.

I claim:

1. In a carburetor, a fuel bowl, a nozzle for fuel from the lower part of the bowl through the nozzle member, a casing enclosing a mixing chamber above lthe nozzle member, astationary gulde sleeve around the upper portion ofthe nozzle member and below the mixing chamber, and a sleeve valve slidably mounted in the guilde bear through gravity at its lower end against the nozzle member, said member being enlarged outwardly between its ends to form a rest for said sleeve valve, said valve at its lower end being reduced in thickness by cutting away a portion at its outer sides which extends to a point above the lower end of the guide sleeve when the valve is in its lowermost position, substantially as and for the purposes described.

2. In a carburetor, a mixing chamber enclosed in a suitablecasing, a stationary guide sleeve located below the chamber and o en at its ends, a nozzle member having a uel carrying passage therethrough extending into the guide sleeve, said member below the lower end of the sleeve havin its sides downwardly and outwar l to make an enlargement of the nozzle mem er, and a sleeve va ve slidably mounted in the guide sleeve with its lower end adapted to bear against the outwardly and downwardly curved sides of the nozzle member when in lower position, said valve at its lower en having a sharp corner formed between its vinner sides and the lower end ofthe valve to contact with and make a seat where contact is made with the nozzle member, as described.

3. In a carburetor, a lfuel bowl, a mixing chamber having communication with the upper part of the fuel bowl, a nozzle member having its upper portion bored lengthwise f'or a part of the length of the-nozzle member and having a lateral passage to the side at the lower end of the opening bored in the nozzle member, a member adjustably mounted on the nozzle member and extending into said lateral passage, a tube located lengthwise of the opening bored in the nozzle member, a sleeve around the upper en'd of the tube and extending above the same, a conduit for fuel from the fuel bowl to said tube, means for manually controlling the amount of fuel passing to the tube, a guide sleeve open at both ends located around the upper part of the nozzle member and below the mixing chamber, and a cylindrical valve slidably mounted inthe guide sleeve and adapted to rest in its lowermost position on a lateral enlargement of the nozzle member at a point above the lateral passage made in the nozzle member, substantially as described.

4. In a carburetor, a casing including a fuel bowl, a mixing chamber having an outlet thereto and a throttle valve in said outlet above the mixing chamber, there bein an open passage between the fuel bowl an mixing chamber, a nozzle member having a fuel passage therethrough for the passage of -fuel, said passage communicating with the fuel bowl, a vertically positioned an'd rotatably mounted member located in the fuel bowl and interposed at its lower end in the fuel passage vto the nozzle member and having means for controlling the amount of fuel passage with rotation -of the member, said .member being bored lengthwise nearly to its upper end and having a lateral opening through its upper end to the opening bored in the member, and a passage leading from the said outlet to the upper end of the member with which said opening may be brought into conjunction on turning the member substantially ninety degrees from its normal nearest closed position.

5. A construction containing the elements waan T. siMrsoN.V

d in combination defined in claim 4, said mem- 

